Does anyone have experience with comparing the performance of these and can endorse one over the other? From what I've read, the Kenko 'Pro300' and Tamron 'Pro' line should be the top model with the best quality, and the 7-element versions should better than the 4-element versions ... but does anybody have any advice here?

Regarding : Tamron Teleconverter1.4C-AFT MCA Quote: CyberDyneSystems“III: "Other" Third Party T-consWe are currently putting together info on other third party manufacture T-cons,. compatibility, autofocus data etc. Please contribute any direct experience or info”Just from my own Experience with several Lenses. The Tamaron AF- Teleconverter1.4C-AFT MCA has worked withCanon 50mm F/1.8Canon 85mm F/1.8Canon 70-200mm F/4.0Tamron 28-75mm F/2.8Sigma 70-200mm F/2.8Positive comments.1 Price is always a consideration, it works about how I expected, i.e. you get what you pay for. Hey, I lucked into this converter for $25.00 from one of our members, I couldn’t go wrong for that price.2 It has done what Tamron said it would.3 For the casual user it probably will be fine, (Not the pro which I am not) the picture is acceptableMy only negative comments have been.1 does not report the focal length.2 Tends to make whites or any bright-light or reflective colors appear brighter than they should be.Especially in bright light or bright days. I see halos. Sometimes.3 Pictures are perceptually a little less sharp than when not using it. Hey, it’s a Tele converter this happens right? I would hope that the more expensive Tamron models, as well as Canon and other 3rd party are sharper?Should some one buy it? Based on your needs and pocket book it is acceptable.Russ

OK, a little teleconverter information to add to the thread. I stacked a Canon 2X and Canon 1.4X on the 5D today with the 400 f/2.8 and maintaned autofocus even though the combination was effectively f/8. Seems that the 1.4X does not relay its existence to the camera when it is stacked behind the 2X, so the camera will report the aperture as if the 1.4X weren't there. I beleive that this has been pointed out on other cameras, but not on the 5D.

Checked it with the 70-200 f/2.8 and it held AF as well, though I wouldn't expect the zoom to give very nice image quality with the stacked converters. Even with the prime, I recommend stopping down a couple of stops if you use this setup. You will lose a fair amount of sharpness.

AF on the 400/2.8 alone or with either teleconverter is excellent. With the stacked combo, it is essential that the setup be used in good light. Otherwise, you'll get erratic hunting for focus. If the lens starts hunting rapidly (and this goes for any lens/telecon combination), let go of the shutter button. You may be better off focusing manually if that happens, unless you can re-aim your shot a bit to get a better contrast point under the AF sensor.

i have just spoken to Sigma uk about the EX 500 F4.5 DG HSM lens and canon tc 1.4 .They said it will auto focus on a 1dmk2 as its under f8 ,they say in there common info Manul focus with any tcon , the guy said this was just to avoid confusion as there are more people with cameras other than the 1d series and they may want to try a tcon and it wont AF .Rob.

The Sigma representative you spoke to is wrong.There are several members on this forum with first hand expeireince with this combnation,. including myself and the MkII will simply not AF with the Sigma 500mm f/4.5 EX HSM and either the Sigma 1.4X or Canon 1.4X

FYI Sigma international in Japan had no idea about this "issue" until it was brought to there attention by this forum.

The working theory is that only the first BIOS of the MkII would allow AF to function.

Also,. AF did work with the 1D (4.5 MP version)

Working theory is a Canon firmware revision early on in the MkII history is the cause of the incompatibility.

intresting and i take what you say as true but i am talking about the NEW ex500f4.5 dg hsm its only being out a couple of month,s not sure if anyone on here has the new one. i have one on order although its not so much going to be used with a tc. so af or not isn't a great concern to me .Rob.edit. i guess it's the 1dmk2 body / firmware thats the problem Not the lens.

Tom W wrote:There is one combination of 1.4X teleconverter and lens involving Sigma and Canon in which the teleconverter's protrusion is just a bit too long for the lens. I'm just not certain which combination it is, but I think it's the Canon 1.4X Mark II telecon and the Sigma 70-200 f/2.8 HSM EX. This is not to be taken as gospel, though. My memory of this isn't perfectly clear.

I seem to recall it's the Canon 1.4 won't fit Sigma's new 150mm macro?Anyway,. we know that the two 1.4s though very similar are different enough that in some cases they don't interchange. I'd actually guess that the difference is in the DIAMETER of the protruding element assembly rather than length,. I just looked at my Canon 1.4 and 100 macro again,. and though they will not fit.. the difference is soooo close that it even looks like if you could remove the black plastic from the t-con protrusion.. they would fit.

CyberDyneSystems wrote:I seem to recall it's the Canon 1.4 won't fit Sigma's new 150mm macro?Anyway,. we know that the two 1.4s though very similar are different enough that in some cases they don't interchange. I'd actually guess that the difference is in the DIAMETER of the protruding element assembly rather than length,. I just looked at my Canon 1.4 and 100 macro again,. and though they will not fit.. the difference is soooo close that it even looks like if you could remove the black plastic from the t-con protrusion.. they would fit.

With a little more thought, I believe that it was the Canon 1.4X II telecon that was slightly too long for the Sigma 70-200 f/2.8. There's a little black rubber "snubber" ring around the front element on the telecon that protects everything if you try, and that's what nudged up against the rear glass of the lens. It was a great way to convince myself that I needed IS!

CyberDyneSystems wrote:Really? the Sigma does? Well,. good to know. I sold my Sigma before I ever gpot the 100 Macro so I never knew this. One to add to the Sticky info.. does it function well?

Both the 1.4 and the 2.0 Sigma EX DG telcons "work" with the canon 100mm f2.8 marco. I say "work" because they fit on the lens and the lens fits on the body, but the AF does that weird very fast hunting thing I like to call "rattling", but with a macro that doesn't bug me because I MF all the macro work I do anyway because the DOF is so short. If using a tripod and MF it's not an issue at all... Haven't really tested the image quality as the 100mm works fine normally for me, I just put the telcons on all my lenses when I got it just to see what works...

Tom W wrote:With a little more thought, I believe that it was the Canon 1.4X II telecon that was slightly too long for the Sigma 70-200 f/2.8. There's a little black rubber "snubber" ring around the front element on the telecon that protects everything if you try, and that's what nudged up against the rear glass of the lens. It was a great way to convince myself that I needed IS!

I haven't tried the Canon 1.4x TC with a Sigma 70-200 f/2.8 but I have tried it with a Sigma 50-500 and it didn't quite fit due to the Canon TC being slightly too wide to fit into the hole in the lens. There was literally 1mm or less in it. It was so close, but just didn't quite fit. I suspect that is the case with the Sigma 70-200 as well.

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